# Certificate Verification Error on Ethereum Ropsten chain **URL:** \ **Category:** Support\ **Created:** [January 29, 2019, 4:47pm UTC](https://community.blockcerts.org/t/certificate-verification-error-on-ethereum-ropsten-chain/1661 "2019-01-29T16:47:42Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![aronning](https://avatars.discourse-cdn.com/v4/letter/a/47e85d/32.png) [@aronning](https://community.blockcerts.org/u/aronning)\ **Post date:** [January 30, 2019, 9:28pm UTC](https://community.blockcerts.org/t/certificate-verification-error-on-ethereum-ropsten-chain/1661/2 "2019-01-30T21:28:26Z")
Check out this recent post, apparently a recent change fixes that issue: > [@\[RESOLVED\] "Transaction occurred at time when issuing address was not considered valid."](https://community.blockcerts.org/t/resolved-transaction-occurred-at-time-when-issuing-address-was-not-considered-valid/1592): > > Hi everyone, Recently I am trying to deploy my first blockcert from the scratch. And here is roughly what I have done: Generated a wallet address (as well as the private key) on the bitcoin testate Created an issuer file and post it to [https://raw.githubusercontent.com/ppfish45/Blockcerts\_test/master/test.json](https://raw.githubusercontent.com/ppfish45/Blockcerts_test/master/test.json) Batched two unsigned certificates with this issuer\_id above Issue the two certificates by cert-issuer Upload the signed certificates onto the [blockcerts.org](http://blockcerts.org) to see whether … --- _[View the full topic](https://community.blockcerts.org/t/certificate-verification-error-on-ethereum-ropsten-chain/1661)._